The first important exposition in the United States was held in Philadelphia in 1876.
A
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Blue－green algae grow abundantly in salt marshes.
People who do not sleep enough tend to become irritable .
Batsfly,ratherthanglide,andthusaretheonlymammalscapableoftrueflight.
InthenortheasternUnitedStates,itrainsintermittently间歇地throughoutthespring.